Do I have to do a Rabne before they do work? For example these door mantras that are said to purify 100 000 aeons of karma or the gyalpo protection from the dudjom tersar. Do these things work without doing consecration? In the east they just buy for example prayerflags and raise them, without empowering them (the lay people, not the Lamas).

I know the Rabne consecration from Namkhai Norbu Rinpoche or better to say I have the Lung to do it. Am i supposed to do this many times or is it done just one time?

Dificult to know, may be it is your mind that works? You just have to have a TV-set in Your home, and it will immediately have an effect on your consciousness. How is that possible? And yet it is most certainly true.You can also give a blessing to your TV-set, or invite monks to do it.